string find_first_of() in C++

find_first_of(): Find the position of a character of a C string. It returns the 

index of the first occurrence. 

Starting from __pos searches forward for one of the 

characters of __s within this string. If found, returns the index where it was found. 

If not found, returns npos.

Parameters: 

__s – String containing characters to locate. 

__pos – Index of character to search from (default 0). 

Syntax:

str.find_first_of(__s , __pos)

For Example:

str = "abcbbabc"

str.find_first_of("b",2) => It returns 3.

Approach

C++

#include <bits/stdc++.h>
using namespace std;

int main()
{
    string str = "abcbbabc";

    cout << str.find_first_of("b", 2) << "\n";
    

    return 0;
}